SVG vs JPG: when to use which (and how to convert)

The core difference: vector vs raster

At the bottom of it, the two formats represent images completely differently. SVG is vector — it stores shapes as math: path commands, rectangles, curves, coordinates. Scale an SVG to ten times its size and the browser just recomputes the same shapes at the new size. It stays crisp, forever.

JPG is raster — a fixed grid of pixels. A JPG that's 800 pixels wide has 800 columns of pixels, and that's all the information it has. Blow it up and the browser has to invent pixels that weren't there, which is exactly why enlarged JPGs look soft and blocky.

That one distinction drives almost every other difference between the two, from file size to transparency to when you should reach for each.

• Scaling: SVG stays sharp at any size; JPG blurs as you enlarge it
• Transparency: SVG supports it natively; JPG doesn't — it needs a solid background
• File size: SVG wins for logos and flat graphics; JPG wins for photos
• Editable: SVG opens in code and design tools; JPG is a finished, flattened image

When to reach for SVG

SVG is the right call for anything geometric or flat-colored: logos, icons, illustrations, charts, diagrams. These compress to tiny file sizes because the math is compact, and they render crisp on retina and 4K displays without shipping multiple versions.

Bonus few people use enough: an SVG is text, so you can style it with CSS, alter a stroke or fill on hover with a single class, and even animate individual parts with SMIL or CSS transitions.

When to reach for JPG

JPG exists for photographs and anything with continuous gradients and lots of detail. It uses lossy compression that's extremely efficient — it throws away subtle differences the eye barely registers and gets enormous file-size wins in return.

That tradeoff (a little quality for a lot of space) is exactly right for photos, backgrounds, and real-world textures. Nobody wants an SVG of their product photography; the path data would be absurd.

Converting between them

SVG → JPG: the converter renders the SVG to a canvas at the scale you choose, then exports at 92% quality. Two gotchas — JPG has no transparency, so the converter composite sits on a white background, and the more complex the SVG, the larger the exported JPG will be at high scale.

JPG → SVG: this runs the opposite way. The image gets reduced to a limited color palette via quantization, then re-emitted as optimized rectangles of those colors. It's a great fit for logos and flat illustrations — but don't run a photo through it and expect a sensible file. Photos quantize into thousands of rectangles and produce a huge SVG that's basically a raster in disguise.